Mesoscale behavior study of collector aggregations in a wet dust scrubber

Li, Xiaochuan; Wu, Xiang; Hu, Haibin; Jiang, Shuguang; Wei, Tao; Wang, Dongxue

doi:10.1080/10962247.2017.1370037

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…It is widely used in a variety of harsh environments with a high dust concentration and a large amount of gas treatment, having an important influence on the control of air pollution. The generation and movement of the collectors (liquid drops, bubbles, and liquid curtain) in dust scrubber is a complex gas-liquid twophase flow process (Lee et al 2013;Li, Wei, and Wang et al 2016;Li et al 2018) that causes differences in the spatial distribution of the collectors. The spatial distribution of the collectors directly impacts the effectiveness of the dust removal process; however, knowledge regarding such distribution is limited by research methods and remains scarce in the current literature.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the spatial distribution of collectors in dust scrubber based on image processing

Xiao

et al. 2019

Journal of the Air & Waste Management Association

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The spatial distribution of the collectors in dust scrubber is key in determining the effectiveness of the dust removal process. In the present study, a high-speed camera was used to capture images of the distribution of the collectors. Some of the image information was extracted by image processing, such as the gray mean (GM), the angular second moment (ASM), and the entropy (ENT) from the gray-level co-occurrence matrix of the image. Subsequently, the spatial distribution rules of the collectors were studied by analyzing the spatial proportion, dispersion area, and uniformity and intensiveness of the collectors. It is an intuitive approach and a novel analysis method for the operating state of dust scrubber. The results show that the spatial distribution of the collectors could be better reflected by image processing methods. The dispersion area of the collectors expanded with an increase in the airflow velocity. When the initial liquid level (ILL) was higher, the collectors expanded in an approximate circular shape, and when the ILL was lower the collectors expanded in an approximate sector shape. In general, the variation trend in the spatial proportion enhanced with an increase in ILL and airflow velocity, which is consistent with the uniformity of collectors. When the liquid level was 0−20 mm and the airflow velocity was greater than 6.5 m/sec, the spatial proportion and uniformity of the collectors reached the highest degree. However, the growth rate of the spatial proportion and uniformity of the collectors slowed down and even led to negative growth when the ILL was lower and the airflow velocity was higher. The intensiveness of the collectors was great when the ILL was higher, which was free from the apparent influence of the airflow velocity and the ILL. However, when the ILL was lower, the intensiveness of the collectors was poor, intensifying as the airflow velocity and ILL increased. When the liquid level was −5−10 mm and the airflow velocity was greater than 8 m/sec, the intensiveness of the collectors reached the highest degree, indicating that a liquid level greater than 0 mm and a higher airflow velocity improved the spatial distribution of the collectors. Implications: This paper focuses on the spatial distribution of the collectors in dust scrubber. Some of the image information was extracted by image processing, such as the gray mean of the image, the angular second moment, and the entropy from the gray-level co-occurrence matrix of the image. The spatial distribution rules of the collectors were studied by analyzing the spatial proportion, the dispersion area, and the uniformity and intensiveness of the collectors.

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Section: Introductionmentioning

confidence: 99%

Analysis of the spatial distribution of collectors in dust scrubber based on image processing

Xiao

et al. 2019

Journal of the Air & Waste Management Association

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“…Li et al. 12,13 investigated the internal pressure distribution, gas-liquid coupling state, and comprehensive operation parameters of a self-excited dust scrubber. Byeon et al.…”

Section: Introductionmentioning

confidence: 99%

“…on dust removal efficiency. Li et al 12,13 investigated the internal pressure distribution, gas-liquid coupling state, and comprehensive operation parameters of a self-excited dust scrubber. Byeon et al 7 designed and developed a modified turbulent wet scrubber to remove air pollutants as they emerge from a coal furnace.…”

Section: Introductionmentioning

confidence: 99%

Study of the pressure drop in dust scrubber affected by liquid flowability

Wei

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part E:

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The complexity of the gas-liquid two-phase flow results in equally complicated pressure drop characteristics for self-excited wet dust scrubbers. In this paper, the pressure drop of the dust scrubber was studied by measuring the total pressure drop R and the differential liquid level Δ H versus the gas velocity v at different initial liquid level b0 values, combined with the liquid flowability. The results showed that the dust scrubber varied its total drag coefficient by changing the differential liquid level Δ H of the liquid-phase and then adjusting the gas-liquid two-phase force balance ahead of and behind the choke. Under the influence of liquid flowability, the throttling strength α exhibited a linear relationship with the gas velocity of the dust scrubber when b0 ≤ 0 mm. The Δ H-v and R- v characteristics of the dust scrubber varied with different values of b0 and v. When b0 > 0, the Δ H-v curve and R- v curve exhibited an explicit quadratic curve relationship. When b0 ≤ 0 mm, the Δ H-v curve and R- v curve exhibited an explicit linear relationship, where the Δ H-v curves can be expressed by a linear equation Δ H = khv+Δ H0, and the gas-phase pressure drop R can be approximately calculated using the differential liquid level Δ H. The liquid flowability can change the choke-sectional to change the total drag coefficient, which reduced in multiple folds with an increase in the gas velocity.

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“…The equipment is 1.0 m long, 0.3 m wide, and 1.2 m high. The maximum gas velocity is 10.59 m s −1 , .…”

Section: Introductionmentioning

confidence: 99%

Column Dust Scrubber Based on an Orifice Plate to Intensify Gas‐Liquid Mixing

Zhang

et al. 2019

Chem Eng & Technol

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A column dust scrubber based on an orifice plate is developed for small and medium‐sized enterprises in China, which urgently need small‐volume, large‐flow scrubbers. The scrubber uses an orifice plate to evenly distribute the gas flow, which forms a uniform and stable impact on the liquid phase. As a result, dust removal via intensified gas‐liquid mixing can be achieved. A laboratory orifice plate scrubber model is developed, prototyped, and preliminarily studied considering the working process of the scrubber (mixed gas‐liquid flow pattern), liquid level, gas flow rate, pressure drop characteristics, dust removal efficiency, etc. The scrubber can achieve a good gas‐liquid mixing state when it is in a stable liquid column flow pattern. The drag coefficient of the scrubber is affected by the discharge of the gas stream to the liquid phase.

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Mesoscale behavior study of collector aggregations in a wet dust scrubber

Cited by 9 publications

References 17 publications

Analysis of the spatial distribution of collectors in dust scrubber based on image processing

Analysis of the spatial distribution of collectors in dust scrubber based on image processing

Study of the pressure drop in dust scrubber affected by liquid flowability

Column Dust Scrubber Based on an Orifice Plate to Intensify Gas‐Liquid Mixing

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